Table Maintenance Generator- One step and two step - difference

Table Maintenance generator: Difference between one step and two steps.
While creating table maintenance generator, we find below options:
1) When we choose one step, we have to give the screen number in Overview Screen field.
2) When we choose two step, we have to give both overview screen number and single screen number.
You can give any number for screen. Don’t give 1000 screen number. As this number is reserved for selection screen.

When we choose two step, two screens will be created for table maintenance. For single step only one screen will be created.
When we choose two step, table maintenance will work as follows
Go to SM30, give the table name for which you have created table maintenance-
Overview screen will be displayed. To create entries, when you click on ‘new entries’. Another screen will be displayed, where you give input and save. You can enter one record at a time.
When we choose single step, table maintenance will work as follows:
Go to SM30; give table name for which you have created table maintenance-
Overview screen will be displayed; To create entries click on ‘new entries’, you can enter the records on the same screen. You can enter multiple records at a time.

We use single step generally, as it is user friendly.
To completely understand the difference and above points please do exercise by creating table maintenance generator in both ways (using single step and two step).